dirty_writeback_centisecs_handler() cleanup

[powerpc.git] / mm / memory.c

diff --git a/mm/memory.c b/mm/memory.c
index cb94488..b3d73bb 100644 (file)
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -78,11 +78,9 @@ unsigned long num_physpages;
  * and ZONE_HIGHMEM.
  */
 void * high_memory;
-unsigned long vmalloc_earlyreserve;
 
 EXPORT_SYMBOL(num_physpages);
 EXPORT_SYMBOL(high_memory);
-EXPORT_SYMBOL(vmalloc_earlyreserve);
 
 int randomize_va_space __read_mostly = 1;
 
@@ -1055,6 +1053,14 @@ int get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
                do {
                        struct page *page;
 
+                       /*
+                        * If tsk is ooming, cut off its access to large memory
+                        * allocations. It has a pending SIGKILL, but it can't
+                        * be processed until returning to user space.
+                        */
+                       if (unlikely(test_tsk_thread_flag(tsk, TIF_MEMDIE)))
+                               return -ENOMEM;
+
                        if (write)
                                foll_flags |= FOLL_WRITE;
 
@@ -1691,9 +1697,10 @@ static int do_wp_page(struct mm_struct *mm, struct vm_area_struct *vma,
                flush_cache_page(vma, address, pte_pfn(orig_pte));
                entry = pte_mkyoung(orig_pte);
                entry = maybe_mkwrite(pte_mkdirty(entry), vma);
-               ptep_set_access_flags(vma, address, page_table, entry, 1);
-               update_mmu_cache(vma, address, entry);
-               lazy_mmu_prot_update(entry);
+               if (ptep_set_access_flags(vma, address, page_table, entry,1)) {
+                       update_mmu_cache(vma, address, entry);
+                       lazy_mmu_prot_update(entry);
+               }
                ret |= VM_FAULT_WRITE;
                goto unlock;
        }
@@ -2525,10 +2532,9 @@ static inline int handle_pte_fault(struct mm_struct *mm,
                pte_t *pte, pmd_t *pmd, int write_access)
 {
        pte_t entry;
-       pte_t old_entry;
        spinlock_t *ptl;
 
-       old_entry = entry = *pte;
+       entry = *pte;
        if (!pte_present(entry)) {
                if (pte_none(entry)) {
                        if (vma->vm_ops) {
@@ -2561,8 +2567,7 @@ static inline int handle_pte_fault(struct mm_struct *mm,
                entry = pte_mkdirty(entry);
        }
        entry = pte_mkyoung(entry);
-       if (!pte_same(old_entry, entry)) {
-               ptep_set_access_flags(vma, address, pte, entry, write_access);
+       if (ptep_set_access_flags(vma, address, pte, entry, write_access)) {
                update_mmu_cache(vma, address, entry);
                lazy_mmu_prot_update(entry);
        } else {
@@ -2674,7 +2679,7 @@ int make_pages_present(unsigned long addr, unsigned long end)
        write = (vma->vm_flags & VM_WRITE) != 0;
        BUG_ON(addr >= end);
        BUG_ON(end > vma->vm_end);
-       len = (end+PAGE_SIZE-1)/PAGE_SIZE-addr/PAGE_SIZE;
+       len = DIV_ROUND_UP(end, PAGE_SIZE) - addr/PAGE_SIZE;
        ret = get_user_pages(current, current->mm, addr,
                        len, write, 0, NULL, NULL);
        if (ret < 0)